AfA480: 2004 Climate Change Fluvial Flood Depth Grids for England

England-wide modelled fluvial flood depth data for a 0.1% annual chance flood event, incorporating a 20% increase in peak flows as a climate change sensitivity scenario. The data was produced in 2004 using the JFlow two-dimensional hydrodynamic model on a 5x5 meter grid as part of a generalized modelling project to define Flood Zones for spatial planning. This specific dataset covers 100x100km Ordnance Survey National Grid tiles (e.g., SZ, SE, SP), and the model has not been updated since its creation.

Use Cases

• High-level regional flood zone definition for spatial planning based on generalized 2004 modelling data.
• Sensitivity analysis of potential climate change effects on flood depth using a scenario of a 20% increase in peak flows.
• Identifying areas for further detailed study by comparing this generalized data with more recent local modelling projects.

Strengths

• Provides national coverage for England, synthesized from multiple grid tile datasets.
• Based on a specific two-dimensional hydrodynamic model (JFlow) and a defined 5x5m grid resolution.
• Created for a specific, low-probability flood event (0.1% annual chance) with a defined climate change parameter (20% peak flow increase).

Limitations

• The model and climate change assumptions are from 2004 and have not been updated, while official climate change allowances have since changed.
• Metadata for size, row count, license, and specific column schema is consistently missing or listed as 'unknown' across all platform entries.
• Explicitly not suitable for property-level assessment, detailed decision-making, or site-specific flood risk assessments.

Provenance

Source

Environment Agency (UK)

Collection Method

Modelled using the JFlow two-dimensional hydrodynamic model.

Time Range

2004 (modelling date)

Freshness

2026-07-06 07:14:59.169531 (metadata update on uk_data platform, though the underlying data is from 2004)

Geography

England, provided in 100x100km Ordnance Survey National Grid tiles (e.g., SZ, SE, SP).